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# This file is part of cloud-init. See LICENSE file for license information.
import json
import logging
from typing import Optional
from cloudinit import dmi, sources, url_helper, util
LOG = logging.getLogger(__name__)
METADATA_URLS = ["http://169.254.169.254"]
METADATA_VERSION = 1
CLOUDCIX_DMI_NAME = "CloudCIX"
class DataSourceCloudCIX(sources.DataSource):
dsname = "CloudCIX"
# Setup read_url parameters through get_url_params()
url_retries = 3
url_timeout_seconds = 5
url_sec_between_retries = 5
def __init__(self, sys_cfg, distro, paths):
super(DataSourceCloudCIX, self).__init__(sys_cfg, distro, paths)
self._metadata_url = None
self._net_cfg = None
def _get_data(self):
"""
Fetch the user data and the metadata
"""
try:
crawled_data = self.crawl_metadata_service()
except sources.InvalidMetaDataException as error:
LOG.error(
"Failed to read data from CloudCIX datasource: %s", error
)
return False
self.metadata = crawled_data["meta-data"]
self.userdata_raw = util.decode_binary(crawled_data["user-data"])
return True
def crawl_metadata_service(self) -> dict:
md_url = self.determine_md_url()
if md_url is None:
raise sources.InvalidMetaDataException(
"Could not determine metadata URL"
)
data = read_metadata(md_url, self.get_url_params())
return data
def determine_md_url(self) -> Optional[str]:
if self._metadata_url:
return self._metadata_url
# Try to reach the metadata server
url_params = self.get_url_params()
base_url, _ = url_helper.wait_for_url(
METADATA_URLS,
max_wait=url_params.max_wait_seconds,
timeout=url_params.timeout_seconds,
)
if not base_url:
return None
# Find the highest supported metadata version
for version in range(METADATA_VERSION, 0, -1):
url = url_helper.combine_url(
base_url, "v{0}".format(version), "metadata"
)
try:
response = url_helper.readurl(url, timeout=self.url_timeout)
except url_helper.UrlError as e:
LOG.debug("URL %s raised exception %s", url, e)
continue
if response.ok():
self._metadata_url = url_helper.combine_url(
base_url, "v{0}".format(version)
)
break
else:
LOG.debug("No metadata found at URL %s", url)
return self._metadata_url
@staticmethod
def ds_detect():
return is_platform_viable()
@property
def network_config(self):
if self._net_cfg:
return self._net_cfg
if not self.metadata:
return None
self._net_cfg = self.metadata["network"]
return self._net_cfg
def is_platform_viable() -> bool:
return dmi.read_dmi_data("system-product-name") == CLOUDCIX_DMI_NAME
def read_metadata(base_url: str, url_params):
"""
Read metadata from metadata server at base_url
:returns: dictionary of retrieved metadata and user data containing the
following keys: meta-data, user-data
:param: base_url: meta data server's base URL
:param: url_params: dictionary of URL retrieval parameters. Valid keys are
`retries`, `sec_between` and `timeout`.
:raises: InvalidMetadataException upon network error connecting to metadata
URL, error response from meta data server or failure to
decode/parse metadata and userdata payload.
"""
md = {}
leaf_key_format_callback = (
("metadata", "meta-data", util.load_json),
("userdata", "user-data", util.maybe_b64decode),
)
for url_leaf, new_key, format_callback in leaf_key_format_callback:
try:
response = url_helper.readurl(
url=url_helper.combine_url(base_url, url_leaf),
retries=url_params.num_retries,
sec_between=url_params.sec_between_retries,
timeout=url_params.timeout_seconds,
)
except url_helper.UrlError as error:
raise sources.InvalidMetaDataException(
f"Failed to fetch IMDS {url_leaf}: "
f"{base_url}/{url_leaf}: {error}"
)
if not response.ok():
raise sources.InvalidMetaDataException(
f"No valid {url_leaf} found. "
f"URL {base_url}/{url_leaf} returned code {response.code}"
)
try:
md[new_key] = format_callback(response.contents)
except json.decoder.JSONDecodeError as exc:
raise sources.InvalidMetaDataException(
f"Invalid JSON at {base_url}/{url_leaf}: {exc}"
) from exc
return md
# Used to match classes to dependencies
datasources = [
(DataSourceCloudCIX, (sources.DEP_FILESYSTEM, sources.DEP_NETWORK)),
]
# Return a list of data sources that match this set of dependencies
def get_datasource_list(depends):
return sources.list_from_depends(depends, datasources)